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WARSAW UNIWERSITY OF TECHNOLOGYWARSAW UNIWERSITY OF TECHNOLOGYInstitute of Geodesy and Geodetic AstronomyInstitute of Geodesy and Geodetic Astronomy

PlPl. Politechniki 1, 00. Politechniki 1, 00--661 Warsaw, Poland 661 Warsaw, Poland iggaigga@gik.pw.edu.pl, phone (+48 22) 6@gik.pw.edu.pl, phone (+48 22) 62222--8585--1515

Mariusz Figurski, Lech Kujawa

GEODETIC AND NON GEODETIC APPLICATIONS GEODETIC AND NON GEODETIC APPLICATIONS PERFORMED BY WUT LACPERFORMED BY WUT LAC

EUREF Permanent GPS Network 4th Local Analysis Centres Workshop18-19 September, 2003Graz, AUSTRIA

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Institute of Geodesy and Geodetic AstronomyInstitute of Geodesy and Geodetic AstronomyInstitute of Geodesy and Geodetic Astronomy

The basic responsibilities of our GPS Analysis Centreinclude:

- processing selected part of permanent EUREFnetwork

- processing periodic campaign CEGRN and CEGRN2, Extended SAGET, EUVN

- processing local and regional campaigns for geophysicaland geodetic needs in the area of Poland

- processing tropospheric zenith delay and TEC.

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Data acquisition system at the Józefosław observatory

TRIMBLE 4000SSE

ASHTECH Z-18GPS-GLONASSTurbo Rogue

SNR 8000

TRIMBLE 4000CORSTATION

RTCM104

DGPSRTK

ZZG AbsoluteGravimeter

TidalGravimeter

A/Dconverter

ServerPC/LINUX METEO-SET

modem radiomodem

Rubidiumstandard

Rubidiumstandard

Rubidiumstandard

GLOBALPOSITIONINGSYSTEM

GRAVITYMEASURMENTS

GRAVITYMEASURMENTS

ONMERIDIANBASELINE METEOROLOGICAL

MEASURMENTS

ASTROMETRICLATITUDESERVICE

radiomodemmodem ANALYSIS CENTRE

ServerPC/LINUX

INTERNETconnection

Work Station Work StationHP J200

ServerPC/LINUX

ICMMNWPM

METEO-datafrom IMWM

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WUT LAC came into being in 1995 year. Since January 1996 year takes part in study active EUREF network (EPN). Worked out by WUT part network EPN LAC it hugs 45 station disposed in grounds of European continent.Since 1997 year till September 2003 worked out year network by WUT LAC, from 20 station broaden to 43 station.

DARE1229

SASS, JOZ21235

KATO, ZYWI1231

INVE, PLYM, SULD

1225

OBET1225

KRAW (Kraków)1203

THU31201

MIKL1192

BOGI1185

SPT01174

StationGPS WEEK

SULP1137

PDEL,LAGO1101

VARS1092

TRAB1047

ESCO1027

UZHL1020

LLIV1015

BUCU1002

VLNS1000

NSSP987

GLSV957

StationGPS WEEK

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Data base GPS/GLONASS EUREF-WUT

IFAG-BKG

SIO

CDDIS

CODE

GRAZ

IGN

FIRE WALL

NTPCYFRONET

Workstation 1 Workstation 2 Workstation 3

The functional scheme ofsystem of data processing GPS observation, applied in WUT EUREF LAC

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Institute of Geodesy and Geodetic AstronomyInstitute of Geodesy and Geodetic AstronomyInstitute of Geodesy and Geodetic Astronomy

Short description of strategy:

- software: Bernese 4.2- orbits, ERP - IGS final- BOR1, WTZR, ONSA constrained (X,Y -0.1 mm, Z-1 mm)- no a priori tropospheric model, Dry-Niell asmapping function

- troposphere modelled each 1 hours/each station(absolute and relative constraints 5 m )

- ionosphere only modelled for ambiguityresolution step

- tidal displacement: IERS96 convention, ocean loading applied- geopotential model: JGM- DE200 planetary ephemeris applied- adjustment: weighted least squares

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Institute of Geodesy and Geodetic AstronomyInstitute of Geodesy and Geodetic AstronomyInstitute of Geodesy and Geodetic AstronomyResults of data processing and analyses

GPS Observation AnalysesChanges of the coordinates obtained from day-to-day GPS data processing

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Institute of Geodesy and Geodetic AstronomyInstitute of Geodesy and Geodetic AstronomyInstitute of Geodesy and Geodetic AstronomyResults of data processing and analyses

GPS Observation AnalysesGPS Observation AnalysesChanges of the coordinates obtained from 1Changes of the coordinates obtained from 1--hour GPS observations filtered to 3hour GPS observations filtered to 3σσ

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ADDNEQCRD WEEKSOLUTION

NEQCRD

CRDGPS WEEK

6

0

FIX CRD

WUTO NE DAY

SO LUTIO N

WUTTRO SINEX

General scheme of computational strategy applied until week 1220 GPS in the Local Analysis Center WUT EUREF- so called „old” computational strategy. In the presented solution the TZD values were determined in a single process with station coordinates estimation. This solution’s advantage was relatively short computational time and storing the normal equations with the station

coordinates data only.

The main disadvantage are the station coordinates for which the TZD values were determined. Recorded in the SINEX TRO format, they were characterized by different values for each observation day, although they belonged to the same GPS week.

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ADDNEQCRD WEEKSOLUTION

NEQCRD

CRDGPS WEEK

6

0

NEQCRD+TRP

6

0

FIX CRD

FIX ALL CRD

ADDNEQTRP WEEKSOLUTION

SINEX TRO

Scheme of the new strategy of GPS observations study applied in WUT LAC. The main change introduced in the study is stations’ coordinates and the determined tropospheric parameters storing in the normal equations file. The tropospheric parameters are estimated only after completion of the computational process on the last day of the week.

At first, the weekly solution is generated (stations’ coordinates – the official product of WUT LAC). The tropospheric parameters are determined using the obtained values, considered as error-free, and applying ADDNEQ software and the prepared in advance normal equations files. Thecomputational process is longer but the determined tropospheric parameters (TZD) are burdened with smaller errors. It my numeric analyses' wereconducted was on appro folding from about 40 station EUREF / IGS

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WUT old and new solution

2,15

2,20

2,25

2,30

2,35

2,40

2,45

2,50

2,55

2,60

52600 52650 52700 52750 52800 52850 52900MJD

TZD

[m]

WUT - new solutionWUT - old solution

The figure presents TZD obtained according to the new and old computational strategies for Józefosław station.

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Station HOFN

-0,015

-0,010

-0,005

0,000

0,005

0,010

0,015

52600 52650 52700 52750 52800 52850 52900

MJD

Diff

eren

ces

TZD

[m]

HOFN WUT new-old solution

The figure presents TZD differences obtained according to the new and old computational strategies for HOFN station (Iceland).

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WUT_new_solution - WUT_old_solution

-0,015

-0,010

-0,005

0,000

0,005

0,010

52650 52700 52750 52800 52850 52900

MJD

TZD

[m

]WUT WUT WUT LocalLocalLocal AnalysisAnalysisAnalysis CentreCentreCentre

The figure presents TZD differences obtained according to the new and old computational strategies for Józefosław station.

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JOZE RMS-TZD

0,0000

0,0005

0,0010

0,0015

0,0020

0,0025

0,0030

0,0035

0,0040

52650 52700 52750 52800 52850 52900

MJD

RM

S [m

]

WUT_final_solutionWUT_old_solution

Temporal plot of RMS error change of TZD calculation for Józefosław station. The figure presents results obtained from WUT EUREF final solution – blue and yellow - WUT EUREF old strategy. Application of the new strategy of TZD computation resulted in increase of the solution precision from 0.9 mm to 0.7-0.8 mm.

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HOFN RMS-TZD

0,0000

0,0050

0,0100

0,0150

0,0200

0,0250

52650 52700 52750 52800 52850 52900

MJD

RM

S TZ

D [m

]

WUT final solutionWUT old solution

Temporal plot of RMS error change of TZD calculation for HOFNstation. The figure presents results obtained from WUT EUREF final solution – green and red - WUT EUREF old strategy.

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Station Józefosław

-0,10

-0,08

-0,06

-0,04

-0,02

0,00

0,02

0,04

52680 52700 52720 52740 52760 52780 52800 52820 52840 52860 52880

MJD

TZD

[m]

WUT_final-WUT_PPP

Plot of TZD differences obtained according to WUT EUREF final and WUT-PPP solutions. The series of TZD differences includes the first half of the 2003. The series of differences ranges from -0.15 to 0.15. The difference of about -0.9 m that occurred on modified julian day 52776 is an uncorrected computational error.

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JOZE RMS-TZD

0,000

0,001

0,002

0,003

0,004

0,005

0,006

0,007

52600 52650 52700 52750 52800 52850 52900

MJD

RM

S [m

]

WUT_final_solutionWUT_ppp_solution

Plot of RMS error change of TZD calculation for Józefosław station. The figure presents results obtained from PPP solution – dark blue and WUT EUREF final. Application of PPP solution causes increase of the error of TZD calculation only up to the level of 3 mm as compared with 1 mm obtained from WUT EUREF solution

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OBS

IGU

MBPE

CP

PPPCRD

Kod + Faza RNXMSTORB-STD

CODSPP

RXOBV3

SAT DCB

GPSEST - RESL4

EST. ION, DCB SAT, DCB RECMAP FUN - 1/COSZ

DEL RES > 0.4m L4

OUT RES

GPSEST - IONL4

EST. ION, DCB RECMAP FUN - MSLM

GPSEST - IONDTEC

EST. IONMAP FUN - MSLM

IONDTEC IONEX ION TEC DCB REC IONEX

INX2GRDSOFT GMT

DTEC MAP

TECMAP

ARCH

PPP PROC

Scheme of one hour GPS processingstrategy.

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Ionospheric maps got with study one hour GPS observation. 2003.04.04

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Antarctic ionosphereric maps obtained from the GPS observations , 2003.04.29.

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TOPEX-ION_GPS

-15

-10

-5

0

5

10

-40 -20 0 20 40 60 80Longitude

TEC

U T-HIMT-codT-jpl

The figure presents diffrences TEC obtained from TOPEX, CODE, JPL and WUT one hour ionosphere model (HIM).

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Conclusions and future

• To improve the study of one hour GPS observations.

• The conduct the exact analyses’ of calculacion the TZD with GPS and GLONASS observation.

• The conduct in process the analysis of the PPP strategy to the calculation TZD.